You are a 16 boy and you had your left ear pierced for 8 months and had not wore an earring for 9 months how long will it take for the piercing to close up?

Uh, strange way of asking the question, but, okay, I've changed genders, and I've had my ear (I assume you mean a regular lobe piercing?) pierced for 8 months... How quickly it will close depends -- in addition to depending on how long you've had it and the location of the piercing -- on the person's body.

It's possible that it will never close, since you/he had it in for so long. A tongue-piercing can close up in less than an hour because the cells in your mouth grow very quickly, but an earlobe piercing is probably, of all piercings, the most slowly-closing, and also the most likely to stay open.

I know of many females who had their ears pierced, didn't wear jewelry for that long (a few months), stopped due to constant irritation/Allergies, and then -- years later -- were like "hmm, I wonder if I still have a hole.." and, lo and behold, they do. So if it's really important for you that this close, you might be out of luck.

I don't know how young you mean by "boy". The younger you/he are/is, the more likely it is to close, perhaps.